Wrong results from Inverse FFT

[AntAgna]

FFT transforms have recently been added to the OpenCLIPP, using the clFFT library.
Forward FFT transform works as expected

But inverse FFT results differ significantly from those obtained from Intel IPP.

Inverse FFT was tested on NVIDIA and Intel hardware and the same result was observed.
The result obtained is also the same as the one given by OpenCL OCV which also uses clFFT.
So it looks like the problem is in clFFT.

More tests should be done to narrow the problem :

• On AMD platform
• Using more simple values
• Verify 1D transform
• Create a simple test program to reproduce problem & report bug